/*弹框样式*/
.black_overlay{
  display: none;
  position: absolute;
  top: 0%;
  left: 0%;
  width: 100%;
  height: 100%;
  background-color: black;
  z-index:1001;
  -moz-opacity: 0.8;
  opacity:.80;
  filter: alpha(opacity=80);
  }
  .white_content {
  display: none;
  position: absolute;
  top: 20%;
  left: 20%;
  width: 60%;
  height: 20%;
  background-color: white;
  border-radius: 5px;
  z-index:1002;
  overflow: auto;
  }
  .white_content_small {
  display: none;
  position: absolute;
  top: 20%;
  left: 10%;
  width: 60%;
  height: 20%;
  background-color: white;
  border-radius: 5px;
  z-index:1002;
  overflow: auto;
  }